Combined coal and gas stove



J. H. SATTLER. COMBINED C OAL AND GAS STOVE. APPLlcATloN FILED MAY 14. 1919.

1,366,421 Patented Jam-25, 1921.

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o o o o o o o o a n o o o o o oo INVENTOI? H. TTLER j Q) @MM @MM2-@af H/S ATTORNEYS J. H. SATTLER. CUMBINED COAL AND GAS STOVE. APPLICATION msn un 14. 1919.

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I 4 3 y J' .22 2 I I 2/5/ Z] K ,E Y l v/ .L: Il Z4( /7 3 A E: E :l I i? WITNESS IN VEN TOR Q BY H. @ATTLER H/s ATTORNEYS UNTTED STATES PATENT OFFICE.

COMBINED VCOAL `ANI) GAS STOVE.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application le'd May 14, 1919. Serial No. 296,980.

T 0 all lwhom t may concern citizen of the United States, and a resident of the city and county of San Francisco and State of California, have invented a certain new and useful Combined Coal and. Gas Stove, of which the following is a specification.

The invention relates to stoves which may be operated with gas or with coal, wood or other smoke producing fuel. Y

An object of the invention is to provide. in a stove of the class described, an oven which is eliiciently and properly heated either by the gas or the coal fire.

VAnother object of the invention is to pro vide, in a stove of the class described2 an oven which is quickly and evenly heated by the gas re.

Another object of the invention is to provide a stove of the class described in which the hot gases from the gas fire pass through the coal fire fines, after passing through 4the oven.

A further object of the .invention is to provide novel means for readily changing the stove from gas burning to coal burning condition and vice versa. Y

The invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description where I shall outline in full, that form of the invention which I have selected for illustration in the drawings accompanying and forming part .of the present specification. In said drawings I have shown one specific forni of the stove of my invention, but it is to be understood that I do not limit myself to such form, since the invention, as expressed in the claims, may be embodied in a plurality of forms.

Referring to the drawings:

Figure 1 is a vertical section of one form of stove of my invention, taken on the line i-i, Fig. 2.

Fig. 2 is a horizontal section taken on the line 2 2, Fig. 1.

Fig. 3 is a horizontal section of the stove taken on the line 3 3, Fig. 1.

Fig. 4 is a vertical section of the stove taken on the line 4 4, Fig.V 1.

The present invention relates particularly to the construction and arrangement of the oven, fines and gas burner within the stove, so that the oven is properly heated when either the coal or the gas fire is being' used,

-gggland relates also to the arrangement of the Be it known that I, JOHN I-I. SAT-Trink, ar"

gas fire with respect to the oven, so that the oven' is quickly and evenly heated. Thev heat for baking or roasting is applied differently when coal is burned than when gas is burner. T'Vhen coal is used as fuel, the food in the oven is heated by radiation, since the products of combustion do not come into Contact with the food. When gas is einvployed, the food is heated by direct contact with the products of combustion, which enter the oven. In accordance with my invention, I arrange the gas burner in a combus- V tion chamber which is iny continuous communication with the ovenand provide means for controlling the flow of air into the combustion chamber,'so that when gas is burned, the combustion chamber may be freely open to the atmosphere, and when coal is burned, communication of the combustion chamber with the atmosphere may be cut o, to prevent the entry of cold air into the oven. I also provide means for controlling the circulation of the hot gases through the oven and these means are preferably connected with the aii` control means, so that both the air and the oven circulation are controlled simultaneously. When gas is being burned, the oven outlets are open, to permit circulation of the products of combustion through the 0ven,'but when coal is burned, the outlets are closed to prevent circulation through the oven.

The stove of my invention is provided with a suitable fire box 2, provided with a grate 3 for the burning of coal, wood or other fuel, and with an ash pit 4 below the grate. From the fire box, the gases of combustion pass into the chamber or front top flue 5, formed between the top 6 of the stove and the top /oven plate 7. From the flue 5 the gases pass down through the front inclined flue 8 into the front back flue 9 formed between the back 12 of the stove and theback oven plate 13. From the front back flue 9 the gases pass into the front bottom flue 14 arranged between the bottom oven plateml and the bottom 16 of the stove. The gases then pass around the end of the partition wall 17 which extends along the bottom, up the side and over the top of the oven, dividing the top, back and bottom fines into front and rear fines. The gases pass around the end of the partition wall into the rear bottom flue 18, up the rear back flue 19 through the rear top flue 21 and into the iue 22 which is connected to the chimney. A wall 23 separates the rear top flue 21 from the fire box and a damper 24A in the partition wall 17 adjacent the wall 23 is controlled by the rod 25 to permit the gases to pass directly from the fire box into the chimney, when desired. When the damper 24 is closed, the gases from the lire in the lire V28', the front wall of which is formed by the rear oven plate 27. The gas 'combustion chamber is closed on the sides by the side wallsV 29, on the bottom by the bottom plate 31 which preferably lies in the plane of, or forms an extension of, the bottom oven plate l5. The chamber 28 is closed at the rear by the rear wall 32 which will be described in detail hereafter. Arranged in the gas combustion chamber 28 and preferably in the corner formed by the bottom plate 31 and the rear wall 32, is a gas burner 33, preferably of substantially the same length as the chamber 28. The rear oven wall 27 is preferably provided with three elongated apertures, one aperture 34being at the bottom of the oven, the second aperture 35 being at about the center lof the oven and the third aperture 36 being at the top of the oven. The apertures in theV gas burner are preferably disposed so that the gas flames are directed toward the rear oven wall 27, immediately above the` bottom aperture 34. The rear wall 32 of the chamber 28 is curved or inclined forwardly fromv the bottoni plane to the top planeA of the middle aperture 35, to cause hot gases of combustion to be directed into the oven through the middle aperture and above the curved portion 37, the wall 32 lies closer to the rear oven wall 27 forming a narrowerV chamber. or flue 38, Ythrough which a portion of the hot gases pass to the upper aperture 36.A Hot gases pass into the oven through the three apertures and on account ofthe shape ofthe rear. wall' 32, they are distributed to flow Vthrough the three. apertures, thereby heating theY oven quickly and evenly.

Air is admitted into the gas combustion chamber 28, through apertures 39 formed in the bottom' plate 31, and the 'passage of air through these apertures is controlled by a damper 4l, which is shown in the closed posi- Y tion in Fig. 2. The damper 41is arranged below the bottom plate 31 and extends longi- V tudinally for the length of the bottom plate,

and is pivoted at its Ycenter 42 to the bottom plate 31. The, apertures are 4formed on opposite sides, both longitudinally andl transi versely, of the center of the bottomplate 31 and are of somewhat irregularl shape, so that they are opened and closed by the m0vement of the damper about itspivot. The

llire discharge from the oven throughV the 'apertures 45Y and 46 .formedV at the lower front ends of the front and back oven' plates discharge apertures at the lower front cor? ners of the oven the gases are compelled to circulate throughout the whole oven, evenly heating it and the foodrtherein, be-

s fore they are discharged.V The discharge of gasesthrough the apertures 45 'Y and 46 is controlled by sliding dampers 47 and 48 which are preferably-connectedto the air supply damper 41 in such manner that when the air supply is closed, the apertures 45 and 46 are closed and viceversa. Vhen Vgas is being burned, all three ofthe dampers are open, and when coal is burned, the three dampers are closed. "The movement of the damper-s convertsV the stove fromV a gas burner to a coal burner, and vice versa, and by connecting the dampers together, only one operation is necessary to efectthe conversion. The damper 47 is connected to the damper 41 by the rod 49 and the damper 48 is connected to the operating rod 43. Since the dampers 47 and 48 are moved in opposite directions by a movement of the rod 43 in one direction, and since the apertures 45 and 46 are arranged close tothe front'of the stove, it is advisable to form one damper 48 of a plate having an aperture 51 therein, which is moved4 into registry with the aperture 46 when the damper is open. Since the movement of the end of the damper 41 to completely open the apertures 39 is greater than the necessary movement of the dempers 26 and'13 respectively. By arranging these 47 and 48, the damper 48 is Yconnected to the rod 43 in such manner that the rod'has a slight initial movement in either direction,

independent of the damper. This is accomplished Vby passing the, rodV 43 through an ear 52 on the damper and providing the rod with abutments 53 on opposite sides of the ear] The saacino of the abutments is such A defiecting plate 55 arranged above the Wall 54 prevents ashes falling from the grate into the iiue. The gases discharge from the flue into the fire box and then may pass directly to the chimney or around the oven through the coal gas lues.

I have provided means for readily lighting the gas burner. Arrangedy Within the oven and forming a closed top channel With the back oven plate 13, is a bar or plate of angular section 56 which is secured to the back oven plate. At its inner end, the plate 56 is provided With a hood 57 overlying one or more of the apertures in the burner, so that When the gas is turned on, some of it flows outward through the channel, Which terminates adjacent the oven door 58. The gas is ignited by a match at the front end of the channel, and immediately fiashes back and ignites the burner. Since the channel is arranged Within the oven, the oven door must be opened before the gas may be ignited, thereby preventing explosions. FV hen the gas burner is first ignited, considerable moisture is formed on the inside of the door, which runs down and collects at the bottom of the door, causing the formation ofrust. To prevent the collection of this Water, and to cause its evaporation quickly so that rust will not have an opportunity to form, I provide small air vents 59 along the bottom of the door, and the passage of air through these vents causes the rapid evaporation of the moisture. These vents are preferably formed by fiuting the bottom of the oven door.

I claim:

l. In a gas stove, an oven having a back plate, a gas combustion chamber at the rear of said plate, a front door for the oven, and an igniting device extending from a point inside the door rearwardly through the oven to the burner in the said chamber so as to convey fuel therefrom, the fuel being ignitible only when the said device is uncovered vby the opened door.

2. In a combined coal and gas stove, a front oven plate, a back oven plate, and a rear oven plate inclosing an oven, a rear gas combustion chamber, said rear oven plate being provided with apertures for the admission of hot gases to the oven from said chamber, and said front and back oven plates being provided at the front of the oven, adjacent the bottom, with outlet apertures for the hot gases, whereby the oven is evenly heated by uniform distribution of heat from the combustion chamber.

3. In a combined coal and gas stove, a front oven plate, a back oven plate, andan apertured rear oven plate inclosing an oven, a gas combustion chamber arranged behind said rear oven plate, a gas burner in said chamber, a damper for controlling the flow of air into said chamber, outlet passages in said front and back oven plates, dampers for controlling the flow of gases through said outletJ passages, and means connecting all of said dampers together.

4. In a combined coal and gas stove, a front oven plate, a back oven plate, a top oven plate, a bottom oven plate, and a rear oven plate inclosing an oven, a iue for the gases of combustion of the coal fire arranged to convey the coal gases over the top plate, down beside the back plate, under the bottom plate, and then return them along the same path, said rear oven plate being provided With apertures, and a gas combustion chamber arranged behind said rear oven 80 plate and above the oven bottom plate.

5. In a combined coal and gas stove, front and back oven plates, top and bottom oven plates, and an apertured rear oven plate inclosing an oven, a flue for the gases of combustion of the coal fire arranged to pass the gases in thermal contact with the top, back and bottom oven plates, a gas combustion chamber arranged behind said rear oven plate and above the said bottom plate, and a gas burner in said chamber.

6. In a combined coal and gas stove, front and back oven plates, top and bottom oven plates and an apertured rear oven plate inclosing an oven, a coal fire box arranged adjacent the front oven plate, a iue for the gases of combustion of the coal fire arranged to pass the gases in thermal contact with the top, back and bottom oven plates, a gas combustion chamber arranged behind said 100 rear oven plate, and gas outlet passages in the front and back oven plates communieating With the fire boX and coal gas flue respectively for the even heating of the oven.

7. In a combined coal and gas stove, front and back oven plates, top and bottom oven plates and an apertured rear oven plate inclosing an oven, the bottom extended rearwardly beyond the rear plate, a coal 110 fire boX arranged adjacent the front oven plate, a flue for the gases of combustion of the coal fire arranged to pass the gases in thermal contact with the top, back and bottom oven plates, a gas combustion chamber 115 arranged behind said rear oven plate and above the extension of the bottom plate,

Vgas outlet passages in the front and back ertured rear oven plate, a gas combustion In testimony whereof, I have hereunto set A chamber arranged behind said rear oven my hand at San'Franoisco,A California, this plate7 a gas burner in said chamber, and a plate overlying a portion of said burner and extending forwardly through the oven to the front thereof and forming With said hack oven plate a gas conducting channel.

1st' day of May, 1919.

' In presence orf- H. Gr. lRosT.

JOHN HQ QSATVTLER.` 

